Genetic parameters for piglet survival, litter size and birth weight or its variation within litter in sire and dam lines using Bayesian analysis

DNRG Kapell, CJ Ashworth, PW Knap, R Roehe

Research output: Contribution to journalArticleResearchpeer-review

33 Citations (Scopus)

Abstract

Genetic parameters for survival at birth, litter size, birth weight and its variation within litter have been estimated in dam (D1, D2 and D3) and sire lines (S1 and S2) and genetic associations among these traits were examined. Genetic parameters, calculated as posterior means, were estimated at piglet (D1 and D2; 23,565 piglets) and litter level (all lines; 3497 litters) using a Bayesian approach. Posterior means of heritabilities for survival at piglet level (SVBP) were consistently low at 0.01, 0.06 to 0.07 and 0.04 to 0.06 for direct (h2 d), maternal (h2 m) and total (h2 t) genetic effects, respectively, with positive posterior means of correlations between the direct and maternal effect (rg-dm). For survival at litter level (SVBL) heritabilities were between 0.05 and 0.20, with highest estimates in lines with lowest birth weight. For individual piglet birth weight (IBW) heritabilities were substantially higher than for SVBP, ranging from 0.13 to 0.19 (h2 d), 0.16 to 0.28 (h2 m) and 0.08 to 0.28 (h2 t). Heritabilities for average litter birth weight (ALBW) ranged from 0.23 to 0.34, while heritabilities for variation of birth weight within litter (STD) ranged from 0.10 to 0.27. Heritabilities for number born in total (NBT) ranged from 0.11 to 0.16. Genetic associations between SVBL and NBT varied from favourable at 0.39 (D1) to unfavourable at −0.22 (D2). Genetic correlations of SVBL with ALBW and STD were mostly favourable (0.22 to 0.55 and −0.18 to −0.52, respectively) except for SVBL-ALBW in D1 (−0.50) and SVBL–STD in S2 (0.48). In D1 favourable genetic correlations were estimated between direct or maternal effects of SVBP and IBW whereas those for D2 were unfavourable. Consistently negative correlations were estimated between direct effects of SVBP and maternal effects of IBW. Adjustment for NBT resulted in slightly higher h2 d and h2 m for SVBP, with unfavourable rg-dm. Selection for survival is expected to be successful because all lines showed considerable variation for this trait and relatively high heritabilities, in particular in lines with low ALBW. Maternal heritabilities of IBW were mostly at moderate magnitude and thus of interest for selection. For most lines, the correlations between traits indicate that selection on either IBW or ALBW is indirectly increasing survival at birth. The variation in heritabilities among lines indicates that the strategy of selection for an optimal birth weight with lowest variation within litter should be considered per line individually to maximise overall genetic improvement in piglet survival and growth. © 2010 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)215 - 224
Number of pages10
JournalLivestock Science
Volume135
Issue number2-3
DOIs
Publication statusFirst published - 2011

Fingerprint

Bayesian theory
dams (mothers)
litters (young animals)
litter size
birth weight
sires
piglets
heritability
maternal effect
genetic correlation
low birth weight
genetic improvement

Bibliographical note

1020937
1023378

Keywords

  • Birth weight
  • Breed
  • Genetic correlation
  • Heritabilities
  • Litter size
  • Piglet survival

Cite this

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abstract = "Genetic parameters for survival at birth, litter size, birth weight and its variation within litter have been estimated in dam (D1, D2 and D3) and sire lines (S1 and S2) and genetic associations among these traits were examined. Genetic parameters, calculated as posterior means, were estimated at piglet (D1 and D2; 23,565 piglets) and litter level (all lines; 3497 litters) using a Bayesian approach. Posterior means of heritabilities for survival at piglet level (SVBP) were consistently low at 0.01, 0.06 to 0.07 and 0.04 to 0.06 for direct (h2 d), maternal (h2 m) and total (h2 t) genetic effects, respectively, with positive posterior means of correlations between the direct and maternal effect (rg-dm). For survival at litter level (SVBL) heritabilities were between 0.05 and 0.20, with highest estimates in lines with lowest birth weight. For individual piglet birth weight (IBW) heritabilities were substantially higher than for SVBP, ranging from 0.13 to 0.19 (h2 d), 0.16 to 0.28 (h2 m) and 0.08 to 0.28 (h2 t). Heritabilities for average litter birth weight (ALBW) ranged from 0.23 to 0.34, while heritabilities for variation of birth weight within litter (STD) ranged from 0.10 to 0.27. Heritabilities for number born in total (NBT) ranged from 0.11 to 0.16. Genetic associations between SVBL and NBT varied from favourable at 0.39 (D1) to unfavourable at −0.22 (D2). Genetic correlations of SVBL with ALBW and STD were mostly favourable (0.22 to 0.55 and −0.18 to −0.52, respectively) except for SVBL-ALBW in D1 (−0.50) and SVBL–STD in S2 (0.48). In D1 favourable genetic correlations were estimated between direct or maternal effects of SVBP and IBW whereas those for D2 were unfavourable. Consistently negative correlations were estimated between direct effects of SVBP and maternal effects of IBW. Adjustment for NBT resulted in slightly higher h2 d and h2 m for SVBP, with unfavourable rg-dm. Selection for survival is expected to be successful because all lines showed considerable variation for this trait and relatively high heritabilities, in particular in lines with low ALBW. Maternal heritabilities of IBW were mostly at moderate magnitude and thus of interest for selection. For most lines, the correlations between traits indicate that selection on either IBW or ALBW is indirectly increasing survival at birth. The variation in heritabilities among lines indicates that the strategy of selection for an optimal birth weight with lowest variation within litter should be considered per line individually to maximise overall genetic improvement in piglet survival and growth. {\circledC} 2010 Elsevier B.V. All rights reserved.",
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Genetic parameters for piglet survival, litter size and birth weight or its variation within litter in sire and dam lines using Bayesian analysis. / Kapell, DNRG; Ashworth, CJ; Knap, PW; Roehe, R.

In: Livestock Science, Vol. 135, No. 2-3, 2011, p. 215 - 224.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Genetic parameters for piglet survival, litter size and birth weight or its variation within litter in sire and dam lines using Bayesian analysis

AU - Kapell, DNRG

AU - Ashworth, CJ

AU - Knap, PW

AU - Roehe, R

N1 - 1020937 1023378

PY - 2011

Y1 - 2011

N2 - Genetic parameters for survival at birth, litter size, birth weight and its variation within litter have been estimated in dam (D1, D2 and D3) and sire lines (S1 and S2) and genetic associations among these traits were examined. Genetic parameters, calculated as posterior means, were estimated at piglet (D1 and D2; 23,565 piglets) and litter level (all lines; 3497 litters) using a Bayesian approach. Posterior means of heritabilities for survival at piglet level (SVBP) were consistently low at 0.01, 0.06 to 0.07 and 0.04 to 0.06 for direct (h2 d), maternal (h2 m) and total (h2 t) genetic effects, respectively, with positive posterior means of correlations between the direct and maternal effect (rg-dm). For survival at litter level (SVBL) heritabilities were between 0.05 and 0.20, with highest estimates in lines with lowest birth weight. For individual piglet birth weight (IBW) heritabilities were substantially higher than for SVBP, ranging from 0.13 to 0.19 (h2 d), 0.16 to 0.28 (h2 m) and 0.08 to 0.28 (h2 t). Heritabilities for average litter birth weight (ALBW) ranged from 0.23 to 0.34, while heritabilities for variation of birth weight within litter (STD) ranged from 0.10 to 0.27. Heritabilities for number born in total (NBT) ranged from 0.11 to 0.16. Genetic associations between SVBL and NBT varied from favourable at 0.39 (D1) to unfavourable at −0.22 (D2). Genetic correlations of SVBL with ALBW and STD were mostly favourable (0.22 to 0.55 and −0.18 to −0.52, respectively) except for SVBL-ALBW in D1 (−0.50) and SVBL–STD in S2 (0.48). In D1 favourable genetic correlations were estimated between direct or maternal effects of SVBP and IBW whereas those for D2 were unfavourable. Consistently negative correlations were estimated between direct effects of SVBP and maternal effects of IBW. Adjustment for NBT resulted in slightly higher h2 d and h2 m for SVBP, with unfavourable rg-dm. Selection for survival is expected to be successful because all lines showed considerable variation for this trait and relatively high heritabilities, in particular in lines with low ALBW. Maternal heritabilities of IBW were mostly at moderate magnitude and thus of interest for selection. For most lines, the correlations between traits indicate that selection on either IBW or ALBW is indirectly increasing survival at birth. The variation in heritabilities among lines indicates that the strategy of selection for an optimal birth weight with lowest variation within litter should be considered per line individually to maximise overall genetic improvement in piglet survival and growth. © 2010 Elsevier B.V. All rights reserved.

AB - Genetic parameters for survival at birth, litter size, birth weight and its variation within litter have been estimated in dam (D1, D2 and D3) and sire lines (S1 and S2) and genetic associations among these traits were examined. Genetic parameters, calculated as posterior means, were estimated at piglet (D1 and D2; 23,565 piglets) and litter level (all lines; 3497 litters) using a Bayesian approach. Posterior means of heritabilities for survival at piglet level (SVBP) were consistently low at 0.01, 0.06 to 0.07 and 0.04 to 0.06 for direct (h2 d), maternal (h2 m) and total (h2 t) genetic effects, respectively, with positive posterior means of correlations between the direct and maternal effect (rg-dm). For survival at litter level (SVBL) heritabilities were between 0.05 and 0.20, with highest estimates in lines with lowest birth weight. For individual piglet birth weight (IBW) heritabilities were substantially higher than for SVBP, ranging from 0.13 to 0.19 (h2 d), 0.16 to 0.28 (h2 m) and 0.08 to 0.28 (h2 t). Heritabilities for average litter birth weight (ALBW) ranged from 0.23 to 0.34, while heritabilities for variation of birth weight within litter (STD) ranged from 0.10 to 0.27. Heritabilities for number born in total (NBT) ranged from 0.11 to 0.16. Genetic associations between SVBL and NBT varied from favourable at 0.39 (D1) to unfavourable at −0.22 (D2). Genetic correlations of SVBL with ALBW and STD were mostly favourable (0.22 to 0.55 and −0.18 to −0.52, respectively) except for SVBL-ALBW in D1 (−0.50) and SVBL–STD in S2 (0.48). In D1 favourable genetic correlations were estimated between direct or maternal effects of SVBP and IBW whereas those for D2 were unfavourable. Consistently negative correlations were estimated between direct effects of SVBP and maternal effects of IBW. Adjustment for NBT resulted in slightly higher h2 d and h2 m for SVBP, with unfavourable rg-dm. Selection for survival is expected to be successful because all lines showed considerable variation for this trait and relatively high heritabilities, in particular in lines with low ALBW. Maternal heritabilities of IBW were mostly at moderate magnitude and thus of interest for selection. For most lines, the correlations between traits indicate that selection on either IBW or ALBW is indirectly increasing survival at birth. The variation in heritabilities among lines indicates that the strategy of selection for an optimal birth weight with lowest variation within litter should be considered per line individually to maximise overall genetic improvement in piglet survival and growth. © 2010 Elsevier B.V. All rights reserved.

KW - Birth weight

KW - Breed

KW - Genetic correlation

KW - Heritabilities

KW - Litter size

KW - Piglet survival

U2 - http://dx.doi.org/10.1016/j.livsci.2010.07.005

DO - http://dx.doi.org/10.1016/j.livsci.2010.07.005

M3 - Article

VL - 135

SP - 215

EP - 224

JO - Livestock Science

JF - Livestock Science

SN - 1871-1413

IS - 2-3

ER -